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首页> 外文期刊>Materials >Fracture Toughness and Elastic Modulus of Epoxy-Based Nanocomposites with Dopamine-Modified Nano-Fillers
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Fracture Toughness and Elastic Modulus of Epoxy-Based Nanocomposites with Dopamine-Modified Nano-Fillers

机译：多巴胺修饰的纳米填充剂的环氧树脂基纳米复合材料的断裂韧性和弹性模量

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摘要

This paper examines the effect of surface treatment and filler shape factor on the fracture toughness and elastic modulus of epoxy-based nanocomposite. Two forms of nanofillers, polydopamine-coated montmorillonite clay (D-clay) and polydopamine-coated carbon nanofibres (D-CNF) were investigated. It was found that Young’s modulus increases with increasing D-clay and D-CNF loading. However, the fracture toughness decreases with increased D-clay loading but increases with increased D-CNF loading. Explanations have been provided with the aid of fractographic analysis using electron microscope observations of the crack-filler interactions. Fractographic analysis suggests that although polydopamine provides a strong adhesion between the fillers and the matrix, leading to enhanced elastic stiffness, the enhancement prohibits energy release via secondary cracking, resulting in a decrease in fracture toughness. In contrast, 1D fibre is effective in increasing the energy dissipation during fracture through crack deflection, fibre debonding, fibre break, and pull-out.
机译：本文研究了表面处理和填料形状因子对环氧基纳米复合材料的断裂韧性和弹性模量的影响。研究了两种形式的纳米填料，即聚多巴胺涂层的蒙脱土（D-粘土）和聚多巴胺涂层的碳纳米纤维（D-CNF）。研究发现，杨氏模量随D-粘土和D-CNF载荷的增加而增加。但是，断裂韧性随着D粘土载荷的增加而降低，但随着D-CNF载荷的增加而增加。使用电子显微镜观察裂缝与填料的相互作用，通过分形分析提供了解释。断口分析表明，尽管聚多巴胺在填料和基体之间提供了强大的粘合力，从而提高了弹性刚度，但这种增强却阻止了通过二次裂纹释放能量，从而导致断裂韧性降低。相比之下，一维纤维可有效地提高断裂过程中通过裂纹变形，纤维脱粘，纤维断裂和拉出产生的能量耗散。

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